Entities are containers with ID and Generation.
ID - unique entity identifier in the world.
Generation - unique entity generation identifier, increase when entity creates from the pool.
GetVersion() - method to return unique version of the entity, increase when entity changed.
Components are storing data. In ME.ECS there are 2 component types: IStructCopyable<> and IStructComponent.
IStructCopyable<> could be stored only once. it could store any types (including managed data) and must implement CopyFrom and OnRecycle methods.
IStructComponent could store just simple types or StackArray.
Systems do visual update at the end of the frame and on the ending of every tick.
Features are introduced for grouping systems and modules into one block. Features are ScriptableObjects and could be ordered in Initializer on your scene
Modules do visual update on the beginning of the frame and on the beginning of every tick. Here you can get controller input and create some markers.
Markers needed to implement Controller/UI events or something that doesn't exist in game state.
